Source code for mechmat.principal.shear_rate
from mechcite import cite
from math import pi
__all__ = ['circle', 'annulus']
[docs]@cite('rao_basic_2017')
def circle(V_dot, r):
r""""
The apparent shear rate for a melt flowing through a cirlce is defined as
.. math::
\dot{\gamma}_{a}=\frac{4 \dot{V}}{\pi R^{3}}
Source: Rao, Natti S. Basic Polymer Engineering Data. Cincinnati, Ohio, USA: Hanser, 2017.
Args:
V_dot: Volumetric_flow in :math:`[L^{3} t^{-1}]`
r: Radius in :math:`[L^{1}]`
Returns:
Apparent shear rate in :math:`[t^{-1}]`
"""
return 4. * V_dot / (pi * r ** 3)
[docs]@cite('rao_basic_2017')
def annulus(V_dot, r_i, r_o):
r"""
The apparent shear rate for a melt flowing through a annulus is defined as
.. math::
\frac{6 \dot{V}}{\pi\left(r_{o}+r_{i}\right)\left(r_{o}-r_{i}\right)^{2}}
Source: Rao, Natti S. Basic Polymer Engineering Data. Cincinnati, Ohio, USA: Hanser, 2017.
Args:
V_dot: Volumetric_flow in :math:`[L^{3} t^{-1}]`
r_i: inner radius in :math:`[L^{1}]`
r_o: inner radius in :math:`[L^{1}]`
Returns:
Apparent shear rate in :math:`[t^{-1}]`
"""
return 6. * V_dot / (pi * (r_o + r_i) * (r_o - r_i) ** 2)